Means for automatically indicating changes in temperature.



Patented July 15, 1902.

' B.'KEYT E. HEANSFUB AUTOMATICALLY INDIQATING CHANGES! TEMPERATURE.

A maefon filed may 20, 1902.

(Ho ludel.)

lllllll ATi'gRA/g 5 v TH: mamas mans ca. mmo-uwo, WASHINQTGN. D I;

C 50 prevented from moving by means of the collar PATENT Orn en.

Brennan KEYTE, OF WHANGAREI, NEW ZEALAND, ASSIGNOR T CHARLES ERNEST RANDOLPH MACK ESY, OF NEW ZEALAND.

THE HILL, WHANGARET, AUCKLAND,

MEANS FOR AUTOMATICALLY lNDlCATlNG CHANGES lN TEMPERATURE.

SPECIFICATION arming part of Letters Patent .N'o. 704,966, dated July 15, 1902.

Application filed May 20, 1902.

. h on the sliding spindle j pressing against it,

To all whom it may concern:

Be it known that I, RICHARD KEYTE, a subject of the King of Great Britain, residing at Whangarei, Auckland, New Zealand have in-* vented a new and useful Means for Au tomatically Indicating a Change in.Temperature; and I do hereby declare the following to'be a full, clear, and exact description of the same.

This invention has been devisedfor the IO purpose of providing means whereby an alarm may be given upon a change of temperature occurring in the vicinity of the appliance.

It is specially applicable for giving an alarm in case of a fire; but it may be used to indi- I 5 cate an abnormal fall in the temperature of the freezing-chambers of ships holds, &c., or for any purpose in which it is desired an alarm should be given when the temperature rises or falls any specific amount.

The appliances employed consist of an ordinary mechanical spring-bell that is fastened upon a suitable base and which when wound up is prevented from ringing by means of a collar upon a spring-inclosed spindleengaging with and holding thetongue oi the curringin-thevicinity-of the alarm the fluid bell. To the bottom extremity of thisrod or, spindle is attached a small capsule composed. of two sheets of a flexible material whose" edges are sealed together so as to inclose a space. Into this space is inserted ether or other gas that expands or contracts rapidly when exposed to heat or cold.

In the accompanying drawings, Figure 1 is a side elevation of the alarnnthe bell being 3 5 shown in section. Fig. 2 is a plan of the same. a, is the'bell, that is screwed upon a central spindle I), attached to the frame. 0, and the tongue (1 of which is actuated by means of the escapement e engaging with the teeth of 40 the'escapement-wheel f. This escapementwheel is caused to revolve by means of a suitable train of wheels actuated by the coiled spring g, that is wound around the spindle b. The spring g is placed in tension by turning the bell a so as to wind the spring up, when its tendency will be to cause the spindle and bell to revolve in the opposite direction, so as to actuate the tongue 01.

Under normal conditions the tongue at is .will expand or contract readily when subject- 'the full amount of the movement of the sides sound an-alarm, which willcontinue sound- Sana, 103,290. on model.)

such collar being kept in engagement with it byv meansrof-the spring is, surrounding the spindle, and the ends of which bear, respectively, against the collar and part of the frame o.- V

The base of the bell frame c'is secured in any approved manner to the supportingframe Z, that is formed with a flanged portion at, by means of which it may be attached to theceiling of a room or in any position it is desired to place the alarm.

The end of the sliding spindle j projects outside the base of the bell-frame and its end is attached to the center of a capsule 11, composed of two diaphragms of thin flexible metal, with their edges fastened together, so as to inclose a space. This space is filled with ether or any other suitable fluid that 7 ed to slight risesorfalls in temperature. regulating-screw 0 passes through the supporting-frame Z and its end bears against the ..free side of-the capsule n.

Upon-an abnormal rise in temperature 00- contained in the capsule n will be caused to expand, thusbulging out the sides of the capsule. Owingv to the screw 0 being a fixture,

8o willbe exerted uponrthe end of the sliding spindle j,-which.will thus be pushed in, freeing its collar h'fro'in contact with the belltongue, so that it will be free to act and ing until the temperature is. lowered or the tension in the spring g becomes exhausted.

When it is desired to have the alarm to sound upon a fall in temperature taking place, the fluid will be placed in the capsule TL in an expanded condition, so that when contracted by cold the two sides of the capsule will be drawntogether. In this case the collar h and spring 70 would bear against the other side of the tongue to that shown in the drawings, so that when the spindlej is drawn out the collar will free the tongue.

By means of the screw 0 the amount that the capsule n will expand before releasing the bell-tongue may be regulated and also Ice the alarm set so as to sound upon any desired temperature being reached.

It is to be understood that I do not confine myself to the use of a mechanical bell such as that described herein and shown in the drawings, as such bell is shown for the purpose of illustrating the invention, and other descriptions and constructions of bells might be employed with equal effectiveness.

What I claim as my invention, and desire to secure by Letters Patent, is

1. In means for indicating a change in temperature, a bell provided with a spring-actuated tongue, a collar upon a sliding spindle engaging with and holding the tongue from movement, and a capsule upon the end of the spindle composed of flexible walls and containing a fluid of a nature such that it will expand and contract when subjected to heat and cold, as herein specified.

2. In means for indicating a change in temperature, a bell provided with a spring-actuated tongue and mounted upon a suitable base secured to a frame by means of which it may be fixed in any desired position, a collar upon a spring-sliding spindle engaging with and holding the tongue, a capsule composed of flexible walls and containinga fluid susceptible to expansion and contraction by heat and cold which is secured to the end of the sliding spindle, and a regulating-screw within the frame, the end of which bears against the other side of the capsule, as herein set forth.

In testimony whereof I have signed this specification in the presence of two subscribing witnesses.

RICHARD KEYTE.

Witnesses:

HILDA WALKER, WILLIAM LAWSON. 

